¹²C yields as functions of initial stellar masses and initial orbital periods, for different metallicity environments. Top: ¹²C yields from wind mass loss. Middle: ¹²C yields from supernova explosions assuming all stars explode. Bottom: total ¹²C yields from the two sources combined assuming the explodability criterion from Maltsev et al. (2025). Left panel: SMC metallicity. Middle panel: LMC metallicity. Right panel: solar metallicity. The lines are color-coded according to the initial orbital periods (see the legend in the top-left panel). The dashed part in each line indicates interpolated results where the stellar models either do not reach core collapse due to numerical issues or experience anomalous helium burning due to helium-carbon shell mergers (indicated by open circles; see Appendix A).